CN1227875A - Technique for eliminating grinding crack - Google Patents
Technique for eliminating grinding crack Download PDFInfo
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- CN1227875A CN1227875A CN 98100663 CN98100663A CN1227875A CN 1227875 A CN1227875 A CN 1227875A CN 98100663 CN98100663 CN 98100663 CN 98100663 A CN98100663 A CN 98100663A CN 1227875 A CN1227875 A CN 1227875A
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Abstract
A technique for eliminating the grinding crack features that before being ground, the carburized alloy steel part to be ground passes through simple heat treatment to eliminate or reduce quenched martensite, increase its strength and close microscopic crack, resulting in thorough elimination of grinding crack.
Description
The present invention relates to metal heat treatmet, it is a kind of method of utilizing metal heat treatmet technology to eliminate grinding crack.
In process of production, often because after the ground finish, piece surface crackle occurs and causes part to be scrapped, the for example speed regulator in the aeronautical product, feathering pump, wind stick, master on the blower fan in the product for civilian use, passive gear and frock and mould, grinding crack often occurs, particularly appear at perviousness such as GCr15 and 18Cr2Ni4WA, 12Cr2Ni4A, 18CrMnTi, 20CrMnTi, 20CrMnMo preferably on the carburizing alloy steel part easier generation grinding crack.
General theory is thought: the major cause that causes this grinding crack is a grinding condition, therefore improves on grinding process and tests, yet produce little effect.
Purpose of the present invention promptly is to solve above-mentioned part is easy to produce grinding crack in grinding process problem, and in experimental study for many years with on a kind of new theoretical basis, proposes a kind of new technology of new elimination grinding crack.
The objective of the invention is to be achieved through the following technical solutions: the carburizing alloy steel part that will need grinding by tempering and again tempering process make quenched martensite be transformed into tempered martensite, improve its intensity, thereby and also can make micro-flaw effectively be made up this vulnerable area of eliminating high-carbon alloy steel, avoid the generation of grinding crack effectively.
Through adopting improvement technology of the present invention to produce utmost point obvious effects, basically thoroughly eliminated grinding crack (see Table, table two) through practicing in a large number, the back of quenching in the table is an existing conventional technology through a tempered only, quench after once, double tempering and once, secondary, three tempered be improvement technology of the present invention.It is remarkable that this technology has effect, and technology is simple, technology maturation, the advantage that is easy to grasp, and general treatment facility gets final product, and just can use under the situation that need not increase any investment.
Table one
| Numbering | Title | Material | Quench | A tempering | Double tempering | Three tempering | Crackle rate % | Remarks | ||||
| ??℃ | Medium | ??℃ | ?h | ??℃ | ?h | ????℃ | h | |||||
| 1 | Shaft pinion | 20CrMnTi | Ooze back direct quenching | 160±10 | ?3 | ?100 | Severe crack | |||||
| 2 | Shaft pinion | 20CrMnTi | 840±10 | Oil | 160±10 | ?3 | 160±10 | ?3 | ??0 | |||
| 3 | The 8M gear shaft | 20CrMnTi | 840±10 | Oil | 160±10 | ?3.5 | ≥80 | |||||
| 4 | The 8M gear shaft | 20CrMnTi | 840±10 | Oil | 160±10 | ?3.5 | 160±10 | ?3.5 | 160±10 | ?3.5 | ??0 | Process stipulation carbide rank is ≯ 7 grades |
| 5 | The 8M gear | 840±10 | Oil | 200 | ?3.5 | ≥80 | ||||||
| ????6 | 8M, 9M gear | 20CrMnTi | 840±10 | Oil | ????200 | ?3.5 | ?200 | ?3.5 | ?≤50 | |||
| ????7 | 840±10 | Oil | ????200 | ?3.5 | ?200 | ?3.5 | ?200 | ?3.5 | ??0 | |||
| ????8 | 4.7M, 6M blower fan gear shaft | 20CrMnTi | Ooze back direct quenching | ????180 | ?3.5 | ?100 | ||||||
| ????9 | 840±10 | Oil | ????180 | ?3.5 | ?≥50 | |||||||
| ????10 | 840±10 | Oil | ????180 | ?3.5 | ?180 | ?3.5 | ?180 | ?3.5 | ??0 | |||
| ????11 | The 6M gear | 20CrMnTi | 840±10 | Oil | ????180 | ?3.5 | ?180 | ?3.5 | ?＜5 | |||
Table two
| Numbering | Title | Material | Quench | Deepfreeze | A tempering | Double tempering | Three tempering | Crackle rate % | Remarks | |||||
| ℃ | Medium | ??℃ | ?h | ??℃ | ?h | ?℃ | ?h | ?℃ | ?h | |||||
| ????1 | Race ring | GCr15 | 840±10 | Oil | 170±10 | ?3 | ?≥50 | Crackle about 30% after the assembling break-in | ||||||
| ????2 | 840±10 | Oil | -75±5 | ?1.5 | 170±10 | ?4 | The mill back increases by 120 ℃ of 2h of timeliness | ?＜1 | Crackle about 0.5% after the assembling break-in | |||||
| ????3 | Driving and driven gear | 12Cr2Ni4A [carburizing] | 790±10 | Oil | 160±10 | ?3 | ?≥50 | Crackle about 30% after the assembling break-in | ||||||
| ????4 | 790±10 | Oil | -75±5 | ?1.5 | 160±10 | ?3.3 | ?120 | ??2 | ?＜1 | Crackle about 0.5% after the assembling break-in | ||||
| ????5 | Driving and driven gear | 18Cr2Ni4WA [carburizing] | 840±10 | Empty oil | 160±10 | ?3 | ?≥50 | Crackle about 30% after the assembling break-in | ||||||
| ????6 | 840±10 | Empty oil | -75±5 | ?1.5 | 160±10 | ?3.16 | 120 | ??2 | ?＜1 | Crackle about 0.5% after the assembling break-in | ||||
| ????7 | Spherical slide block | GCr15 | 840±10 | Oil | 160±10 | ?3.5 | ???50 | Crackle appearred in 8 years in assembling back stock | ||||||
| ????8 | Slurry cover nut | 18Cr2Ni4WA [generation material] | 840±10 | Oil | ??160 | ?4 | ???100 | Crackle deeply＞0.3 | ||||||
| ????9 | 840±10 | Oil | ??160 | ?4 | ?150 | ??5 | ???0 | |||||||
| ????10 | 840±10 | Oil | ??160 | ?4 | ?120 | ??2 | 160 | ?3 | ???0 | |||||
| ????11 | Gear | 12Cr2Ni4A | 790±10 | Oil | ??160 | ?4 | ???79 | Add up 19,15 crackles are arranged | ||||||
| ????12 | 790±10 | Oil | ??160 | ?4 | ?150 | ??2 | ???0 | Add up 20 | ||||||
| ????13 | Gear | 18Cr2Ni4WA | 840±10 | Oil | ??160 | ?4 | ???100 | Add up 10 | ||||||
| ????14 | 840±10 | Oil | ??160 | ?4 | ?150 | ??3 | ???0 | Add up 15 | ||||||
Embodiment one: the gear shaft made from 20CrMnTi improved its heat Treatment of Carburized technology before grinding:
(1) carburizing: identical with common process
(2) quench: go into the stove 840 ℃ of quenchants of heating and be no more than 50 ℃, for oil, oily temperature
± 10 ℃ of big parts were greater than 30 minutes cooling time in oil;
(3) tempering: go into stove and heat and be no more than 2 hours after 180 ℃ of quenchings and promptly carry out tempering, in the stove
± 10 ℃ of soaking time 〉=3.5 hour, the water-cooled of coming out of the stove then
Cooling (room temperature) 〉=5 minute;
(4) double tempering: go into stove and heat and to carry out double tempering after 180 ℃ of tempering, in the stove during insulation
Between ± 10 ℃ 〉=2.5 hours, the water-cooled of coming out of the stove then cooling (room temperature)
〉=5 minutes.
Embodiment two: with the gear shaft that 20CrMnTi makes, its 1～4 procedure is identical with embodiment one, increases five processes in addition again:
(5) three tempering: go into stove and heat and to carry out three tempering behind 180 ℃ of double temperings, protect in the stove
± 10 ℃ of warm time 〉=2.5 hour, the air cooling of coming out of the stove then.
Below be embodiment three and embodiment four,, two kinds of technologies listed in same form for improvement technology of the present invention and existing conventional technology are compared:
Embodiment three:
| Part name: driving and driven gear material: 12CrNi4A[carburizing part] | |||
| Common process | Quench: 790 ± 10 ℃, oil | Improve technology | Quench: 790 ± 10 ℃, oil |
| Tempering: 160 ± 10 ℃, 240 minutes, empty [notes]: more than be to use technology before 82 years | Deepfreeze :-75 ± 5 ℃, 90 minutes, sky | ||
| Tempering: 160 ± 10 ℃, 240 minutes, sky | |||
| Quench: 790 ± 10 ℃, oil | Tempering: 150 ± 10 ℃, 〉=120 minutes | ||
| Deepfreeze :-75 ± 5 ℃, 90 minutes, sky | Increase by 120～150 ℃, the timeliness operation of 2h after the grinding | ||
| Tempering: 160 ± 10 ℃, 240 minutes, sky | |||
Embodiment four:
| Part name: bearing figure material: GCr15 | |||
| Common process | Quench: 840 ± 10 ℃, oil | Improve technology | Quench: 840 ± 10 ℃, oil |
| Tempering: 170 ± 10 ℃, 240 minutes, empty [notes]: more than be to use technology before 82 years | Tempering: 150 ± 10 ℃, 120 minutes, sky | ||
| Deepfreeze :-75 ± 5 ℃, 90 minutes, sky | |||
| Quench: 790 ± 10 ℃, oil | Tempering: 170 ± 10 ℃, 240 minutes, sky | ||
| Deepfreeze :-75 ± 5 ℃, 90 minutes skies | Increase by 120～150 ℃, the timeliness operation of 2h after the grinding | ||
| Tempering: 170 ± 10 ℃, 240 minutes, sky | |||
Claims (3)
1. new technology of eliminating grinding crack, for the carburizing alloy steel part that needs grinding, its carburizing, quenching technology are identical with common process:
(1) carburizing:
(2) quench: go into stove and be warmed to 790 ℃ of quenchants and be no more than 50 ℃, for oil, oily temperature
～840 ℃ of big parts in oil cooling time greater than 30 minutes; It is characterized in that: before carrying out ground finish, also will carry out following thermal treatment process:
(3) tempering: go into stove and be warmed to and be no more than 2 hours after 150 ℃ of quenchings and promptly carry out tempering, in the stove
～220 ℃ of soaking time 〉=3.5 hour, water-cooled 〉=5 of coming out of the stove then
Minute;
(4) double tempering: go into and promptly carry out double tempering after stove is warmed to tempering, soaking time in the stove
150 ℃～220 ℃ 〉=2.5 hours, water-cooled 〉=5 minute of coming out of the stove then;
2. the new technology of elimination grinding crack according to claim 1 is characterized in that: carry out three tempering after carrying out double tempering again, its concrete technology is as follows:
(5) three tempering: go into and promptly carry out three tempering after stove is warmed to double tempering, insulation in the stove
150 ℃～220 ℃ time 〉=2.5 hour, the air cooling of coming out of the stove then.
3. the new technology of elimination grinding crack according to claim 1 is characterized in that: increase cold treatment process together between tempering and double tempering technology, its concrete technology is as follows: cooling is 90 minutes under negative 75 ℃ ± 5 ℃ low temperature, air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98100663A CN1079838C (en) | 1998-03-03 | 1998-03-03 | Technique for eliminating grinding crack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98100663A CN1079838C (en) | 1998-03-03 | 1998-03-03 | Technique for eliminating grinding crack |
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| Publication Number | Publication Date |
|---|---|
| CN1227875A true CN1227875A (en) | 1999-09-08 |
| CN1079838C CN1079838C (en) | 2002-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98100663A Expired - Fee Related CN1079838C (en) | 1998-03-03 | 1998-03-03 | Technique for eliminating grinding crack |
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| CN (1) | CN1079838C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295352C (en) * | 2004-05-31 | 2007-01-17 | 张胜才 | Alloy/high alloy cemental steel cementing quenching method in low-carbon |
| CN102899475A (en) * | 2012-09-14 | 2013-01-30 | 上海钢球厂 | Steel ball for blower fan |
| CN103014303A (en) * | 2012-12-13 | 2013-04-03 | 内蒙古北方重工业集团有限公司 | Production method of thin and long thin-plate type part |
| CN103143902A (en) * | 2013-01-31 | 2013-06-12 | 洛阳新火种节能技术推广有限公司 | Process of precision casting K242 alloy positioning sector |
| CN109483331A (en) * | 2018-11-12 | 2019-03-19 | 重庆羿业气门有限公司 | A kind of integrated processing technology for metal works |
| CN115558885A (en) * | 2022-10-18 | 2023-01-03 | 东北大学 | Profile cooperative processing method based on grinding active carburization |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5993831A (en) * | 1982-11-17 | 1984-05-30 | Mitsubishi Motors Corp | White pig iron hardening method on cam sliding surface |
| JPH0734134A (en) * | 1993-07-20 | 1995-02-03 | Toyota Motor Corp | Surface treatment of crank shaft |
-
1998
- 1998-03-03 CN CN98100663A patent/CN1079838C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295352C (en) * | 2004-05-31 | 2007-01-17 | 张胜才 | Alloy/high alloy cemental steel cementing quenching method in low-carbon |
| CN102899475A (en) * | 2012-09-14 | 2013-01-30 | 上海钢球厂 | Steel ball for blower fan |
| CN103014303A (en) * | 2012-12-13 | 2013-04-03 | 内蒙古北方重工业集团有限公司 | Production method of thin and long thin-plate type part |
| CN103143902A (en) * | 2013-01-31 | 2013-06-12 | 洛阳新火种节能技术推广有限公司 | Process of precision casting K242 alloy positioning sector |
| CN109483331A (en) * | 2018-11-12 | 2019-03-19 | 重庆羿业气门有限公司 | A kind of integrated processing technology for metal works |
| CN115558885A (en) * | 2022-10-18 | 2023-01-03 | 东北大学 | Profile cooperative processing method based on grinding active carburization |
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| Publication number | Publication date |
|---|---|
| CN1079838C (en) | 2002-02-27 |
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